[SI-LIST] Re: Overshoot / Undershoot

  • From: Dagmara Avanindra <dagmara.avanindra@xxxxxxxxx>
  • To: andrew.seddon@xxxxxxxxxxxx
  • Date: Thu, 12 Jan 2006 17:05:42 -0800

Andrew,
you need to look at the spec of the receiver to see what is the max
overshoot it can tolearate AND for how long it can tolerate it.
If you have a very excessive overshoot, such as the one you mention in your
email, you may forward bias clamping diodes on the receiver.

Thanks,
Dagmara

On 1/12/06, Andrew Seddon <andrew.seddon@xxxxxxxxxxxx> wrote:
>
> Hello,
>
>
> I was wondering if anybody had an idea of what is a typically acceptable
> bad
> but workable overshoot/undershoot on a 3.3V system? For example I see some
> memory IC's can take transients upto 5.5v where as the datasheet max is
> say
> +0.3. Obviously this figure is based on DC.
>
> I presume the major effect's of over/under shoot are to reduce working
> life
> of the IC and make the circuit potentially fail at temperature extremes?
>
> So when you guys analyse overshoot/undershoot how do you decide if it's
> acceptable?
>
> Kind regards,
>
> Andrew
>
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